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Figure F41. Zr/TiO2 and Zr/Y ratios for first order mid-ocean-ridge segments along the EPR from 14°N to 19°S and ODP/IODP Site 1256 (Leg 206 and Expedition 309/312). Zr and Y data are taken from PETDB ( and the plotted values are the average of segment centers; error bars = 1σ. The spreading rate of each segment is calculated by the Online Ridge Spreading rate calculator (​users/​menke/​plates.html). The spreading rate of Site 1256 is given by Wilson (1996). The range of latitude of each segment center is indicated by the labels underneath the x-axis, and numbers above the x-axis are the spreading rate (full rate) of each segment.

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